-3m=-9m+42

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Solution for -3m=-9m+42 equation: 



-3m=-9m+42

We move all terms to the left:

-3m-(-9m+42)=0

We get rid of parentheses

-3m+9m-42=0

We add all the numbers together, and all the variables

6m-42=0

We move all terms containing m to the left, all other terms to the right

6m=42

m=42/6

m=7

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